{"id":2061,"date":"2020-07-29T23:30:27","date_gmt":"2020-07-29T15:30:27","guid":{"rendered":"http:\/\/39.97.231.10\/?p=2061"},"modified":"2020-07-29T23:30:27","modified_gmt":"2020-07-29T15:30:27","slug":"mysql%e5%8f%82%e6%95%b0%e8%a7%a3%e6%9e%90innodb_flush_neighbors","status":"publish","type":"post","link":"http:\/\/www.weijing.co\/?p=2061","title":{"rendered":"MySQL\u53c2\u6570\u89e3\u6790innodb_flush_neighbors"},"content":{"rendered":"<div>\n<h2>innodb_flush_neighbors \u53c2\u6570\u662fInnoDB\u7528\u6765\u63a7\u5236buffer pool\u5237\u810f\u9875\u65f6\u662f\u5426\u628a\u810f\u9875\u90bb\u8fd1\u7684\u5176\u4ed6\u810f\u9875\u4e00\u8d77\u5237\u5230\u78c1\u76d8\uff0c\u5728\u4f20\u7edf\u7684\u673a\u68b0\u786c\u76d8\u65f6\u4ee3\uff0c\u6253\u5f00\u8fd9\u4e2a\u53c2\u6570\u80fd\u591f\u51cf\u5c11\u78c1\u76d8\u5bfb\u9053\u7684\u5f00\u9500\uff0c\u663e\u8457\u63d0\u5347\u6027\u80fd\u3002<\/h2>\n<\/div>\n<div>\n<div>\n<ul>\n<li>\u53d6\u503c\u8303\u56f4\uff1a0\uff0c1\uff0c2<\/li>\n<li>\u9ed8\u8ba4\u503c\uff1a5.7\u7248\u672c\u4e3a1\uff0c 8.0\u7248\u672c\u4e3a0<\/li>\n<\/ul>\n<p>\u542b\u4e49\uff1a<\/p>\n<ul>\n<li>\u8bbe\u7f6e\u4e3a0\u65f6\uff0c\u8868\u793a\u5237\u810f\u9875\u65f6\u4e0d\u5237\u5176\u9644\u8fd1\u7684\u810f\u9875\u3002<\/li>\n<li>\u8bbe\u7f6e\u4e3a1\u65f6\uff0c\u8868\u793a\u5237\u810f\u9875\u65f6\u8fde\u5e26\u5176\u9644\u8fd1\u6bd7\u8fde\u7684\u810f\u9875\u4e00\u8d77\u5237\u6389\u3002<\/li>\n<li>\u8bbe\u7f6e\u4e3a2\u65f6\uff0c\u8868\u793a\u5237\u810f\u9875\u65f6\u8fde\u5e26\u5176\u9644\u8fd1\u533a\u57df\u7684\u810f\u9875\u4e00\u8d77\u5237\u6389\u30021\u4e0e2\u7684\u533a\u522b\u662f2\u5237\u7684\u533a\u57df\u66f4\u5927\u4e00\u4e9b\u3002<\/li>\n<\/ul>\n<p>\u5982\u679cMySQL\u670d\u52a1\u5668\u78c1\u76d8\u662f\u4f20\u7edf\u7684HDD\u5b58\u50a8\u8bbe\u5907\uff0c\u6253\u5f00\u8be5\u53c2\u6570\uff0c\u80fd\u591f\u51cf\u5c11I\/O\u78c1\u76d8\u5bfb\u9053\u7684\u5f00\u9500\uff0c\u63d0\u9ad8\u6027\u80fd\uff0c\u800c\u5bf9\u4e8eSSD\u8bbe\u5907\uff0c\u5bfb\u9053\u65f6\u95f4\u7684\u6027\u80fd\u5f71\u54cd\u5f88\u5c0f\uff0c\u5173\u95ed\u8be5\u53c2\u6570\uff0c\u53cd\u800c\u80fd\u591f\u5206\u6563\u5199\u64cd\u4f5c\uff0c\u63d0\u9ad8\u6570\u636e\u5e93\u6027\u80fd\u3002\u7531\u4e8eSSD\u8bbe\u5907\u7684\u666e\u53ca\uff0cMySQL 8.0 \u5c06\u8be5\u53c2\u6570\u7684\u9ed8\u8ba4\u503c\u75311\u8c03\u6574\u4e3a0\u3002<br \/>\ninnodb_flush_neighbors\u53c2\u6570\u6e90\u7801\u5206\u6790\uff1a<br \/>\n\u6e90\u7801\u7248\u672c\uff1a5.7.19<br \/>\n\u5728\u6e90\u7801\u4e2d\uff0cinnodb_flush_neighbors \u53c2\u6570\u5bf9\u5e94\u7684\u53d8\u91cf\u4e3asrv_flush_neighbors\uff0c\u8fd9\u662f\u4e00\u4e2a\u5168\u5c40\u53d8\u91cf\uff0c\u9ed8\u8ba4\u503c\u4e3a1\uff0c\u5982\u4e0b\uff1a<br \/>\nulong srv_flush_neighbors = 1;<br \/>\n\u6574\u4e2a\u4ee3\u7801\u4e2d\uff0c\u7528\u5230\u53d8\u91cf srv_flush_neighbors \u7684\u5730\u65b9\u53ea\u6709\u4e00\u4e2a\uff0c\u90a3\u5c31\u662f\u51fd\u6570 buf_flush_try_neighbors()\uff0c\u8be5\u51fd\u6570\u4f4d\u4e8e\u6e90\u7801\u6587\u4ef6\uff1astorage\/innobase\/buf\/buf0flu.cc<br \/>\nbuf_flush_try_neighbors() \u51fd\u6570\u4e3b\u8981\u903b\u8f91\uff0c\u5982\u4e0b\uff1a<\/p>\n<pre>static ulint buf_flush_try_neighbors(\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0const page_id_t&amp;\u00a0\u00a0page_id,\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0buf_flush_t\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0flush_type,\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0ulint\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0n_flushed,\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0ulint\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0n_to_flush)\n{\n    if (UT_LIST_GET_LEN(buf_pool-&gt;LRU) &lt; BUF_LRU_OLD_MIN_LEN\n              || srv_flush_neighbors == 0) {\n            \/\/ [low, high] \u533a\u95f4\u4e0d\u5305\u542b\u90bb\u8fd1\u7684\u9875\u9762\n            low = page_id.page_no();\n            high = page_id.page_no() + 1;\n    }else{\n            \/\/ [low, high] \u533a\u95f4\u5305\u542b\u90bb\u8fd1\u7684\u9875\u9762\n            low = (page_id.page_no() \/ buf_flush_area) * buf_flush_area;\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0high = (page_id.page_no() \/ buf_flush_area + 1) * buf_flush_area;\n            if (srv_flush_neighbors == 1) {\n                ...\n                \/\/ \u6839\u636e [low, high] \u533a\u95f4\u5185\u7684\u9875\u662f\u5426\u53ef\u4ee5\u5237\u76d8\uff0c\u6765\u8fdb\u4e00\u6b65\u7f29\u5c0f [low, high] \u533a\u95f4\n            }\n    }\n    ...\n    \/\/ \u6839\u636e [low, high] \u533a\u95f4\u8fdb\u884c\u810f\u9875\u5237\u76d8\n}\n<\/pre>\n<p>buf_flush_try_neighbors() \u51fd\u6570\u6839\u636e [low, high] \u533a\u95f4\u6765\u5237\u810f\u9875\u3002<\/p>\n<ul>\n<li>\u5f53 srv_flush_neighbors \u4e3a 0\u65f6\uff0c [low, high] \u53ea\u5305\u542b\u4e00\u4e2a\u9875\u9762\u3002<\/li>\n<li>\u5f53 srv_flush_neighbors \u4e3a 1\u65f6\uff0c [low, high] \u5305\u542b\u90bb\u8fd1\u7684\u9875\u9762\uff0c\u9875\u9762\u6570\u5c0f\u4e8e\u7b49\u4e8e\u53d8\u91cf\u503cbuf_flush_area\u3002<\/li>\n<li>\u5f53 srv_flush_neighbors \u4e3a 2\u65f6\uff0c [low, high] \u5305\u542b\u90bb\u8fd1\u7684\u9875\u9762\uff0c\u9875\u9762\u6570\u7b49\u4e8e\u53d8\u91cf\u503cbuf_flush_area\u3002<\/li>\n<\/ul>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>innodb_flush_neighbors \u53c2\u6570\u662fInnoDB\u7528\u6765\u63a7\u5236buffer pool\u5237\u810f\u9875\u65f6\u662f\u5426\u628a\u810f &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"http:\/\/www.weijing.co\/?p=2061\"> <span class=\"screen-reader-text\">MySQL\u53c2\u6570\u89e3\u6790innodb_flush_neighbors<\/span> \u67e5\u770b\u5168\u6587 &raquo;<\/a><\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"default","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":""},"categories":[90,88],"tags":[],"uagb_featured_image_src":{"full":false,"thumbnail":false,"medium":false,"medium_large":false,"large":false,"1536x1536":false,"2048x2048":false,"mailpoet_newsletter_max":false,"woocommerce_thumbnail":false,"woocommerce_single":false,"woocommerce_gallery_thumbnail":false,"shop_catalog":false,"shop_single":false,"shop_thumbnail":false},"uagb_author_info":{"display_name":"weijing","author_link":"http:\/\/www.weijing.co\/?author=4"},"uagb_comment_info":0,"uagb_excerpt":"innodb_flush_neighbors \u53c2\u6570\u662fInnoDB\u7528\u6765\u63a7\u5236buffer pool\u5237\u810f\u9875\u65f6\u662f\u5426\u628a\u810f&hellip;","_links":{"self":[{"href":"http:\/\/www.weijing.co\/index.php?rest_route=\/wp\/v2\/posts\/2061"}],"collection":[{"href":"http:\/\/www.weijing.co\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.weijing.co\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.weijing.co\/index.php?rest_route=\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"http:\/\/www.weijing.co\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2061"}],"version-history":[{"count":0,"href":"http:\/\/www.weijing.co\/index.php?rest_route=\/wp\/v2\/posts\/2061\/revisions"}],"wp:attachment":[{"href":"http:\/\/www.weijing.co\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2061"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.weijing.co\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2061"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.weijing.co\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2061"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}